email.domain.com (hosted) does not display on company networked computers.

I recently moved my company from a work group to a WIndows 2008 R2 DC network.
DNS role, AD DC Role, The DHCP is handled by a router and not the 2008 R2 server.
Before i made this change, the company would go to a 3rd party providerfor hosted email.
 the company domain controller is  contoso.com, hosted email is email.contoso.com live website url on the internet is also contoso.com

OWA email works when i go to the website from a computer outside of the network, contoso.com is also live on the internet, but cannot be reached from company computers.
I assume this is a DNS issue. What can I do so internal network users can still use their online web access email from email.contoso.com and reach the company website which is hosted elsewhere?
FureioAsked:
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davorinConnect With a Mentor Commented:
You need to add to your internal DNS server another A record for email.contoso.com pointing to external IP address where the mail server is hosted.
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davorinCommented:
Actually when you use the same domain name for local network and publicly accessed external server you will need to set records on your internal DNS server for all your externally located servers.
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FureioAuthor Commented:
Thanks, I figured thats what it was. Where do i create the A record? There are multiple zones here.
Forward look up zones -- msdcs.domain.com -- domain.com -- _msdcs -- _sites -- _tcp -- _udp --- DomainDnsZones, etc.

Domain.com has A records for all the workstations in the domain. Is this where the internet website record goes or does it go somewhere else?

What settings do i use for the A record?
Name: www.domain.com? 
FQDN area has domain.com filled in and greyed out(the internal domain)

Do i place a tick mark next to create associated pointer PTR record?
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davorinCommented:
This post is describing what you have to do:
https://support.gearhost.com/KB/a302/add-records-to-dns-in-windows-2008.aspx

Expand forward lookup zone, right click on domain contoso.com (actually your external domain name or as you specifies in your second post - domain.com), choose add A host, type in email (as the mail server is at email.contoso.com) and public ip address of the mail server. PTR record in this case you don't need to create on your DNS server as all host (from internet and your internal network) will will resolve it on internet.
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davorinCommented:
Sorry, typo - I meant "or as you have specified in your second post"
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